182 строки
4.6 KiB
C
182 строки
4.6 KiB
C
/* Software floating-point emulation.
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Copyright (C) 1997,1998,1999 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Richard Henderson (rth@cygnus.com),
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Jakub Jelinek (jj@ultra.linux.cz),
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David S. Miller (davem@redhat.com) and
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Peter Maydell (pmaydell@chiark.greenend.org.uk).
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc.,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#ifndef __MATH_EMU_SOFT_FP_H__
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#define __MATH_EMU_SOFT_FP_H__
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#include <asm/sfp-machine.h>
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/* Allow sfp-machine to have its own byte order definitions. */
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#ifndef __BYTE_ORDER
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#include <endian.h>
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#endif
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#define _FP_WORKBITS 3
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#define _FP_WORK_LSB ((_FP_W_TYPE)1 << 3)
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#define _FP_WORK_ROUND ((_FP_W_TYPE)1 << 2)
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#define _FP_WORK_GUARD ((_FP_W_TYPE)1 << 1)
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#define _FP_WORK_STICKY ((_FP_W_TYPE)1 << 0)
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#ifndef FP_RND_NEAREST
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# define FP_RND_NEAREST 0
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# define FP_RND_ZERO 1
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# define FP_RND_PINF 2
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# define FP_RND_MINF 3
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#ifndef FP_ROUNDMODE
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# define FP_ROUNDMODE FP_RND_NEAREST
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#endif
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#endif
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/* By default don't care about exceptions. */
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#ifndef FP_EX_INVALID
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#define FP_EX_INVALID 0
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#endif
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#ifndef FP_EX_OVERFLOW
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#define FP_EX_OVERFLOW 0
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#endif
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#ifndef FP_EX_UNDERFLOW
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#define FP_EX_UNDERFLOW
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#endif
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#ifndef FP_EX_DIVZERO
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#define FP_EX_DIVZERO 0
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#endif
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#ifndef FP_EX_INEXACT
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#define FP_EX_INEXACT 0
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#endif
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#ifndef FP_EX_DENORM
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#define FP_EX_DENORM 0
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#endif
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#ifdef _FP_DECL_EX
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#define FP_DECL_EX \
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int _fex = 0; \
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_FP_DECL_EX
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#else
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#define FP_DECL_EX int _fex = 0
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#endif
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#ifndef FP_INIT_ROUNDMODE
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#define FP_INIT_ROUNDMODE do {} while (0)
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#endif
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#ifndef FP_HANDLE_EXCEPTIONS
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#define FP_HANDLE_EXCEPTIONS do {} while (0)
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#endif
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/* By default we never flush denormal input operands to signed zero. */
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#ifndef FP_DENORM_ZERO
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#define FP_DENORM_ZERO 0
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#endif
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#ifndef FP_INHIBIT_RESULTS
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/* By default we write the results always.
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* sfp-machine may override this and e.g.
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* check if some exceptions are unmasked
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* and inhibit it in such a case.
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*/
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#define FP_INHIBIT_RESULTS 0
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#endif
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#define FP_SET_EXCEPTION(ex) \
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_fex |= (ex)
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#define FP_UNSET_EXCEPTION(ex) \
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_fex &= ~(ex)
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#define FP_CLEAR_EXCEPTIONS \
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_fex = 0
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#define _FP_ROUND_NEAREST(wc, X) \
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do { \
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if ((_FP_FRAC_LOW_##wc(X) & 15) != _FP_WORK_ROUND) \
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_FP_FRAC_ADDI_##wc(X, _FP_WORK_ROUND); \
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} while (0)
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#define _FP_ROUND_ZERO(wc, X) 0
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#define _FP_ROUND_PINF(wc, X) \
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do { \
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if (!X##_s && (_FP_FRAC_LOW_##wc(X) & 7)) \
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_FP_FRAC_ADDI_##wc(X, _FP_WORK_LSB); \
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} while (0)
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#define _FP_ROUND_MINF(wc, X) \
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do { \
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if (X##_s && (_FP_FRAC_LOW_##wc(X) & 7)) \
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_FP_FRAC_ADDI_##wc(X, _FP_WORK_LSB); \
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} while (0)
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#define _FP_ROUND(wc, X) \
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do { \
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if (_FP_FRAC_LOW_##wc(X) & 7) \
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FP_SET_EXCEPTION(FP_EX_INEXACT); \
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switch (FP_ROUNDMODE) \
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{ \
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case FP_RND_NEAREST: \
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_FP_ROUND_NEAREST(wc,X); \
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break; \
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case FP_RND_ZERO: \
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_FP_ROUND_ZERO(wc,X); \
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break; \
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case FP_RND_PINF: \
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_FP_ROUND_PINF(wc,X); \
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break; \
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case FP_RND_MINF: \
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_FP_ROUND_MINF(wc,X); \
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break; \
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} \
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} while (0)
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#define FP_CLS_NORMAL 0
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#define FP_CLS_ZERO 1
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#define FP_CLS_INF 2
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#define FP_CLS_NAN 3
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#define _FP_CLS_COMBINE(x,y) (((x) << 2) | (y))
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#include <math-emu/op-1.h>
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#include <math-emu/op-2.h>
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#include <math-emu/op-4.h>
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#include <math-emu/op-8.h>
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#include <math-emu/op-common.h>
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/* Sigh. Silly things longlong.h needs. */
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#define UWtype _FP_W_TYPE
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#define W_TYPE_SIZE _FP_W_TYPE_SIZE
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typedef int SItype __attribute__((mode(SI)));
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typedef int DItype __attribute__((mode(DI)));
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typedef unsigned int USItype __attribute__((mode(SI)));
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typedef unsigned int UDItype __attribute__((mode(DI)));
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#if _FP_W_TYPE_SIZE == 32
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typedef unsigned int UHWtype __attribute__((mode(HI)));
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#elif _FP_W_TYPE_SIZE == 64
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typedef USItype UHWtype;
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#endif
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#ifndef umul_ppmm
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#include <stdlib/longlong.h>
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#endif
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#endif /* __MATH_EMU_SOFT_FP_H__ */
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